Improvement in engraving and chasing machines



R. R. ATCHISON.

ENGRAVING AND CHASING MACHINE.

Patented March 14, 1876.,

ATTUBNEYS WITNESSES UNITED STATES PATENT OFFICE.

ROBERT E. ATOHISON, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN ENGRAVING AND CHASING MACHINES.

Specification forming part of Letters Patent No. 174,715, dated March14, 1876; application filed February 21, 1876.

To all whom it may concern Beit known that I, ROBERT RALsToN ATcH- ISON,of the city of Boston, in the county of Sufl'olk and State ofMassachusetts, have invented a new and Improved Engraving and ChasingMachine, of which the following is a specification.

My invention consists of a couple of toolstocks, each carrying anengraving, chasing, or other tool in a hollow revolving mandrel, andmade to reciprocate, at the same time alternately with each other, threeor four times with each revolution for making engraved or chasedground-work on gold or plated .jewelry, silver, silver-plated, or washedware.

Figure 1 is a perspective view of my improved machine. Fig. 2 is asectional elevation. Fig. 3 is a plan view of the cam-ring for makingthe reciprocating movements of the tool-stocks, and Fig. 4 is a sideelevation of one of the tool-stocks with a tool in it.

A and B represent a couple of tool-stocks, arranged side by side in thehollow revolvingmandrel 0, so as to slide up and down freely at the sametime that they are turned around by the mandrel D, levers suspended in wreadily for changing to use tools with dili'erentshaped points fordififerent work.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The combination of stationary cam-ring K, levers D, pulley F, hollowmandrel G, and the tool-stocks A B, substantially in the manne and forthe purpose described.

ROBERT E. ATGHISON. Witnesses:

AUGUSTUS DOYLE, WILLIAM B. WALKER.

